[vm/ffi] Fix asan test expectations
[vm/ffi] Fix asan test expectations

Fixes: https://github.com/dart-lang/sdk/issues/39720

Follow up of: https://dart-review.googlesource.com/c/sdk/+/127144

Change-Id: Ic82f656e619d2ae23f102fd494e00929d69510f1
Cq-Include-Trybots: luci.dart.try:vm-kernel-asan-linux-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128066
Reviewed-by: Martin Kustermann <a35dd5b79fac84b2bb3b026a16b8becc55af5961@google.com>
Commit-Queue: Daco Harkes <930cbae0ca77f1954c53e32620d89cfcca318f00@google.com>
Auto-Submit: Daco Harkes <930cbae0ca77f1954c53e32620d89cfcca318f00@google.com>

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